In a set of panels for an assembled product, a first panel and a second panel may be assembled with a third panel. An end surface of the third panel includes a first tongue and a second tongue. The first panel and the second panel are configured to be arranged with their respective end surfaces facing each other. A first tongue of the third panel is configured to be arranged in an edge groove of the first panel and a second tongue of the third panel is configured to be received in an edge groove of the second panel to join the panels at least in a first direction. The first panel and the second panel may be of a first panel type, and the third panel may be of a second panel type. A corner element may be connected to a side panel of an assembled product.